Figure 1.
Location of the Loess Plateau and the study site.
Table 1.
Characteristics of different vegetation types.
Figure 2.
Distribution of soil organic carbon (SOC, A), total nitrogen (TN, B), particulate organic carbon (POC, C), and labile organic carbon (LOC, D) contents of different land used types in soil depth of 0–200 cm.
The error bars are the standard errors.
Figure 3.
Differences in soil organic carbon (SOC, A), total nitrogen (TN, B), particulate organic carbon (POC, C), labile organic carbon (LOC, D) contents between SC and RP, CK or AB (RP/CK/AB - SC).
Error bars are the standard errors. Different lowercase letters indicate significant difference among different land use types within same soil layer (P<0.05). The same for Fig 4
Figure 4.
Stocks of soil organic carbon (SOC, A), total nitrogen (TN, B), particulate organic carbon (POC, C), labile organic carbon (LOC, D) of different land use types.
The error bars are the standard errors.
Figure 5.
Distribution ratios of soil organic carbon (SOC, A), total nitrogen (TN, B), particulate organic carbon (POC, C), labile organic carbon (LOC, D) in soil depth of 0–200 cm under different land use types.
Figure 6.
Comparison of stratification ratio of soil organic carbon (SOC, A), total nitrogen (TN, B), particulate organic carbon (POC, C), labile organic carbon (LOC, D) under different land use types.
Different uppercase letters indicate significant difference among different soil depths within same land use type while the different lowercase letters indicate significant difference among different land use types within same soil depth. The error bars are the standard errors.
Figure 7.
Carbon management index (CMI) values of different land use types at different soil depths.
The error bars are the standard errors. Different lowercase letters indicate significant difference among different land use types within same soil depth.
Table 2.
Regression equations among SOC stocks and CMI/SR for different soil layers.